2777 KB32 KB200020242012He, HuanLe, Nghi LBSluys, Lambertus JohannesStroeven, Pietštevilka:2letnik:31str. 79-87ISSN:1580-3139COBISSID:30769881URN:URN:NBN:SI:doc-LXZBJCFYenDruštvo za stereologijo in kvantitativno analizo slike, Medicinska fakultetaImage analysis and stereologybetonmultiple tree structuringporosimetryporozimetrijavečkratno strukturirano drevovirtual materialvirtualni materialPorosimetry by random node structuring in virtual concrete|Two different porosimetry methods are presented in two successive papers. Inspiration for the development came from the rapidly-exploring random tree (RRT) approach used in robotics. The novel methods are applied to virtual cementitious materials produced by a modern concurrent algorithm-based discrete element modeling system, HADES. This would render possible realistically simulating all aspects of particulate matter that influence structure-sensitive features of the pore network structure in maturing concrete, namely size, shape and dispersion of the aggregate and cement particles. Pore space is a complex tortuous entity. Practical methods conventionally applied for assessment of pore size distribution may fail or present biased information. Among them, mercury intrusion porosimetry and 2D quantitative image analysis are popular. The mathematical morphology operator opening can be applied to sections and even provide 3D information on pore size distribution, provided isotropy is guaranteed. However, aggregate grain surfaces lead to anisotropy in porosity. The presented methods allow exploration of pore space in the virtual material, after which pore size distribution is derived from star volume measurements. In addition to size of pores their continuity is of crucial importance for durability estimation. Double-random multiple tree structuring (DRaMuTS), introduced earlier in IA&S (Stroeven et al., 2011b) and random node structuring (RaNoS) provide such informationTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaDruštvo za stereologijo in kvantitativno analizo slike